Topic: Billet clutch hub.

[754]

Anyone got a hub they can weigh? and visually guess how much is the spline(mainshaft) portion. The aluminum same size would weigh a third as much.

I just looked at one in a pic on here, looks like you could drill the rivits out to reuse the center spline, then carve out a basket. The trick is to mill the finger slots and keep groove width consistent..looks like you can add the outer ring and bolt that on. Could be done in one piece if you had a slotter.

Then hard anodize basket and rivet or bolt spline back in..

[754]

It looks like the 750 is either deeper or smaller diameter. If the spline were the same it may fit but you may have to make an outer cover or extension.

Making the basket would probably be less work.

[bert96]

I think there's a market for a top quality billet clutch hub.I would buy one for sure

[Big Jay]

Why???

[MRieck]

 Why not just lighten the steel basket?

[754]

Why??

Because its there, and I can.

Lighter, lower rotating weight.

Because it is enjoyable to make your own parts for your bikes.




I would take a long hard look and see if there is a gain in function, certainly not hoping to make money doing it.

I have wondered though why it could not be converted to a weighted pressure plate, like a Karata Glide.. I know it would take a lot of work.

[Big Jay]

Well for durability, the steel backets are the best. They don't explode and take out the cases, and the clutch plates don't groove them up so bad that they need to be replaced.

The reason we do billet backets for the busa,GSXR1000s, old GS Suzukis, etc is because the oem baskets are a casting and can come apart under load. The old KZ Kawasaki with a steel basket is the strongest out there. OEM aluminum baskets have even been replaced with Kaw steel backets for racing.

Never heard of anyone wanting to go the other direction.

The billet aluminum basket would have to be of a thicker cross section to get the strength needed. I really doubt there would be much of a weight savings when you were all done,

Jay

[754]

I think the grooving would be eliminated with hard anodize. I did see one that had stainless wear covers.

I did notice most are forged, cheaper yet very strong.. I did not realize that later bikes used cast alloy for baskets.

Weight..twice as much meat in crucial areas still saves 1/3 weight  over steel.

But I keep looking at them weighted clutches and think it should be tried on a sohc. Are they impractical for street use, that is what I am not clear on. seems to me increased clutch pressure as rpm rises is a good thing.

It is fun sometimes though to have something that no one else has..like my high pipe..

[Terry in Australia]

After owning several GS Suzuki's, I wouldn't recommend an alloy clutch basket to anyone.......... 

[MRieck]

.

But I keep looking at them weighted clutches and think it should be tried on a sohc. Are they impractical for street use, that is what I am not clear on. seems to me increased clutch pressure as rpm rises is a good thing.

It becomes very hard to shift at high RPM's especially 1st to 2nd. There isn't enough power in a street CB engine to warrant a lock up clutch IMO. If you have good pack height and Barnett springs you are OK 99% of the time. The 1% would be a big nitrous shot which would probably blow a few things up.

[Sam Green Racing]

Stop talking about blow ups when I am trying to decide which nitrous kit to buy.

Sam.

[scunny]

don't sniff too much of that nitrous Sam, it curls your hair 

[Sam Green Racing]

It would take a miracle to make my hair curl Scun

[Big Jay]

.

But I keep looking at them weighted clutches and think it should be tried on a sohc. Are they impractical for street use, that is what I am not clear on. seems to me increased clutch pressure as rpm rises is a good thing.

It becomes very hard to shift at high RPM's especially 1st to 2nd. There isn't enough power in a street CB engine to warrant a lock up clutch IMO. If you have good pack height and Barnett springs you are OK 99% of the time. The 1% would be a big nitrous shot which would probably blow a few things up.

All you need to do is use our clutch kit that comes with two extra friction and steel plates. Around 20% more clutch. Installs like a stock clutch. Will handle more nitrous that your Honda rods can.

http://cbrzone.com/clutches.html

Jay

[754]

Ah, now I can see how it is machined,

ballnosed endmill @ a 45 deg angle with live holder (powered)

on a  mill  with an indexer or in a CNC late with live tooling..
 
ha!!